/*
 * Copyright 2009-2009 Tanesha Project. All rights reserved.
 * 
 * Redistribution and use in source and binary forms, with or without modification, 
 * are permitted provided that the following conditions are met:
 * 
 *    1. Redistributions of source code must retain the above copyright notice, 
 *    	 this list of conditions and the following disclaimer.
 *    2. Redistributions in binary form must reproduce the above copyright notice,
 *    	 this list of conditions and the following disclaimer in the documentation 
 *    	 and/or other materials provided with the distribution.
 * 
 * THIS SOFTWARE IS PROVIDED BY THE FREEBSD PROJECT ``AS IS'' AND ANY EXPRESS OR 
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF 
 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT 
 * SHALL THE FREEBSD PROJECT OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, 
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, 
 * OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF 
 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE 
 * OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
 *  OF THE POSSIBILITY OF SUCH DAMAGE.
 * 
 * The views and conclusions contained in the software and documentation are those 
 * of the authors and should not be interpreted as representing official policies, 
 * either expressed or implied, of the Tanesha Project.
 */
package com.google.api.chart;

import com.google.api.chart.encoding.JoinHelper;

public final class GridLineMaker {

	public static GridLineMaker gridline(double stepX, double stepY) {
		return new GridLineMaker().stepSize(stepX, stepY);
	}
	
	private int paramLevel = 0;
	private double x;
	private double y;
	private double line = 1.0;
	private double blank = 0.0;
	private double offsetX;
	private double offsetY;
	
	private void updateParamLevel(int level) {
		if (level > paramLevel)
			paramLevel = level;
	}
	
	private GridLineMaker() {
	}
	
	@Override
	public String toString() {
		String r = JoinHelper.doubleFormat(x) + "," + JoinHelper.doubleFormat(y);
		if (paramLevel > 0)
			r += "," + JoinHelper.doubleFormat(line) + "," + JoinHelper.doubleFormat(blank);
		if (paramLevel > 1)
			r += "," + JoinHelper.doubleFormat(offsetX) + "," + JoinHelper.doubleFormat(offsetY);
		return r;
	}
	
	public GridLineMaker stepSize(double x, double y) {
		this.x = x;
		this.y = y;
		return this;
	}
	public GridLineMaker segmentLength(double line, double blank) {
		this.line = line;
		this.blank = blank;
		updateParamLevel(1);
		return this;
	}
	public GridLineMaker offset(double offsetX, double offsetY) {
		this.offsetX = offsetX;
		this.offsetY = offsetY;
		updateParamLevel(2);
		return this;
	}
}
